Fluid-operated motor.



W. A. SMITH.

FLUID OPEHATED MOTOR.

`APPLICATION FILED DEc.21.191s.

@YS. n Patented Feb. 26, 1918.

2 SHEETS-SHEET 2.

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llilll WJILLIAIVI la. SMKTH, F DENVER, CULORADO, ASSIGNOR T0 THE DENVERROCK lRlILL MANUFACTURING COMPANY, 0F DENVER, COLORADO, A. CORPORATON OFDELA- WARE.

FLUID-OPERATED MOTIt.

Specicatton of Letters Patent.

Patented. lieb. 26, 1218..

Application filed Becember 27, 1916. Serial No. 139,140.

To aZZ whom it may concern:

Be it known that l, WILLIAM A. SMITH, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado, haveinvented certain new and useful mprovements in Fluid-Uperated Motors, ofwhich the following is a specification.

The present invention relates more particularly to. valveless motors ofthe type in which the iston directly controls the distribution o themotive fluid and its exhaust.

rlhe object is'to provide simple means of a novel and effectivecharacter,

The preferred embodiment of the invention is illustrated in theaccompanying drawings, wherein:-

Figure 1 is a longitudinal sectional view through a rock drill, showingthe motor as a part thereof.

Figs. 2 and 3 are cross sectional views o the lines 2 2 and 3--3 of Fig.1.

Fig. 4 is a detail longitudinal sectiona view through the motor andtaken on the line 4-4 of Fig. 2.

Fig. 5 is a detail sectional view on the line 5-5 of Fig. 4.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

In the embodiment illustrated, a cylinder member is employed, comprisinga body 6 having a piston chamber 7 therein. rll`he rear end of saidpiston chamber is closed by a rear head block 8 and a front head block9, the latter containing a tappet 10 that projects into the pistonchamber. A reciprocatory hammer piston 11 is located in the chamber 7and is arranged to strike the rear end of the tappet 10, as will bereadily understood.

Motive fluid is supplied from any suitable source through a nipple 12that communicates with a valve casing 13 formed upon one side of thehead block 8. A rotary taper valve 14 of well known form is located inthe casing 13 and controls the supply of fluid to a port 15 formed inthe head block and communicating with branches 16 also formed in saidhead block. These branches in turn are in communication withlongitudinally disposed supply channels 17 formed in opposite sides ofthe cylinder body and that terminate at their front ends in supply ports18 that open into the piston chamber? between its ends.

r1`he iston 11 is provided in its opposite sides with longitudinallydisposed distributing channels 19 that are in constant communicationwith the supply ports 18. These channels, as shown in Fig. l, terminateshort of the ends of the piston hammer, and their ends are alternatelymovable into communication with recesses 2O formed in the cylinder bodywalls in line with the ports 18. The recesses arelonger than thedistance between the ends of the distributing channels 19 and the endsof the hammer piston.

Exhaust permitting means is provided, comprising oppositely disposedfront and rear sets of ports 21 that are in communication withexhaustpassageways 22 formed in opposite Walls of the piston body 6 and openingto the atmosphere. These exhaust ports 21 are out of line with thesupply ports 18 and recesses 20.

In order to maintain the piston hammer to a lixed path of movement, saidhammer is provided with longitudinally disposed feather receivinggrooves 23 that terminate short of the front end of the hammer pistonand preferably open through the rear end thereof. These grooves aredisposed out of line. with both the exhaust ports 21 and the supplyports 18, and engaged therein are suitable feathers 24 fixed in thecylinder body. The feathers, by thus holding the piston, serve tomaintain the distributing channels 19 in proper relation to the supplyports 18 and recesses 20, and by preventing the turning of the pistonhammer, they pre vent improper relations between the distributingchannels 19 and the exhaust ports 21.

It is believed that the operation of the device will be readilyunderstood. When motive fluid is admitted to the port 15, it will passthrough the branches 16 into the pasageways 17, and thus enter throughthe ports 18 into the distributing channels 19. rllhese channels willalternately direct the motive fluid to the front and rear ends of thepiston chamber 7, and consequently against the opposing front and rearfaces of the piston hammer, causing the reciprocation of the same. thusadmitted to one end of the piston cham- When motive fluidV is ber, theexhaust -ports at the other endwill be uncovered by the pistonpermitting the exhaust of the fluid from the opposite end.

From the foregoing, itis thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled inthe art, without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction, may be resorted to without departing from thespirit or sacrificing any of the advantagesof the invention.

Having thus fully described my invention, whatv I claim as new, anddesire to secure by Letters Patent, is l 1. In apparatus of thecharacter set forth, the combination with a cylinder member comprising abody having a piston chamber and a head block, of means for supplyingmotive fluid to the cylinder member, comprising an inlet having branchesin 'the head block and passageways in the cylinder body leading from thebranches and having supply ports opening into the piston chamber, apiston operating 'in the chamber, said piston having distributinglchannels in constant communication wit the ports and said channelsalternately opening into the piston chamber on opposite sides of thepiston accordingly as said piston reciprocates', meansv permitting theexhaust from the piston chamber on opposite sides of the piston, saidexhaust permitting means being controlled by the piston, thedistributing channels of said piston overrunning or passing thevtransverse planes of the exhaust permitting means while maintainingcommunication with said supply ports but being out of line with saidexhaust permitting means, and means for maintaining the piston to afixed path to maintain the proper relation of the ports and channels andprevent improper relations between the channels and exhaust permittingmeans.

2. In apparatus of the character set forth,

'haust permitting means in the cylinder wall mit of longitudinal linewith the supply ports, said cylinder body having internal recesses inits end portions in substantial line with the supply ports, the pistonhaving longitudinally disposed channels terminating short of the endsthereof, said channels bein constantly in communication with the supp yports and alternately communicating with the recesses, and said pistonalternately covering and uncovering the exhaust permitting means, thedistributing channels overrunning or passing the transverse planes ofthe exhaust permitting means but being out of line therewith whilemaintaining communication with the said supply ports, a featherreceiving groove in, the piston terminating short of one end lthereofand being out of line with the distributing ports and exhaust permittingmeans, and a feather carried by thecylinder body and engaged in thefeather receiving groove to hold the piston to a fixed path and thusmaintain .the distributing channelsin proper association with the supplyports and recesses while preventing improper associations between tliechannels and exhaust permitting means.

In testimony whereof, I aix my signature in the presence of twowitnesses.

Witnesses:

D. E. STRoU'r, R. G. Davis.

